[infinispan-issues] [JBoss JIRA] (ISPN-3092) AutoNodeSelector throws ArrayIndexOutOfBoundsException when indexName is long

[Sanne Grinovero (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-3092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sanne Grinovero resolved ISPN-3092.
-----------------------------------

    Resolution: Done

    
> AutoNodeSelector throws ArrayIndexOutOfBoundsException when indexName is long
> -----------------------------------------------------------------------------
>
>                 Key: ISPN-3092
>                 URL: https://issues.jboss.org/browse/ISPN-3092
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Querying
>            Reporter: Wouter De Borger
>            Assignee: Sanne Grinovero
>             Fix For: 5.3.0.CR1
>
>
> When hibernate search is used (with capedwarf for example), adding a fourth server to the cluster crashes infinispan.
> I've narrowed the problem down to org.hibernate.search.backend.impl.jgroups.AutoNodeSelector:78
> Here the following formula is used to calculate an array index
> int selectionRange = members.size() - 1;
> int selected = ( indexName.hashCode() % selectionRange) + 1;
> if indexname is long (like "default_taskworker-java__com.google.appengine.api.datastore.Entity")
> the hashcode becomes negative due to integer overflow, resulting in a negative index

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